Safety device for doorknobs



W. JOHNSTON SAFETY DEVICE FR DOORKNOBS Oct. 12,1926.

Filed April 22, 1926 Mfr/dy A TToRNE'Ys.

m. m m m Patented ct. 12, 1926'.

y UNITED STATES PATENT OFFICE.

WILLIAM JOHNSTON, OF GREAT FALLS, MONTANA, ASSIGNOR ONE-HALF TO ANNIE W. SHIELL, OF GREAT FALLS, MONTANA.

SAFETY DEVICE FOR DOORKNOBS.

Application filed April 22, 19276. Serial No. 103,821.

This invent-ion relates to improvements in door knobs, and more particularly to a structure whereby the knob is prevented .from accidentally becoming displaced olf its spindle.

The object et the invention is the construction of a simple and etlicient device for retaining the fastening screw from bccomi ing unseated or disconnected tro-in the shank, except when the operator deliberately removes the screw.

l/Vitli this and other objects in view, my

invention consi-sts of certain novel constructions, combinations and arrange/niente oit parts, as will be hereinafter .tully described, illustrated in the accompanying drawings, and more particularly pointed out iii the appended claim.

In the drawings vltigiiie 1 is a-vieu partly in .sectioii and partly in elevation of an embodiment oi the present invention.

Figure 2 is a sectional view taken on line 2, 2, Figure` l.

Figure 3 is an enlarged fragmentary, lon gitudinal sectional view of the presentv invention.

Figure l is a sectional view taken on line 4, 4.-, Figure 3, and looking in the direction oit the. arrows.

lTigigure 5 is a sectional view taken on line 5. 5. Figure 3, and looking in the direction ot the arrows.

1e'terring to the drawings by numerals, l

designates Athe door to which plate 2 is Secured. Extending through the door l is tight against spindle 3 to hold the knob thereon. Then by slightly turning the threaded sleeve 7 so as to place aperture 8 out of alignment, or registering position with the top of the screw 9, as shown in Figure 2, the screw can not become unseated oit' the spindle and shank. My sleeve 9 abuts at .its inner end against the outer end of collar l and at its outer end against the knob 5. The inner threaded end 6a of said shank extends under said collar 4 for allowing accurate assembling of the elements of my `complete device. By having the device so constructed, I have found from actual experience with a working model that I have produced a decided improvement over all prior patented devices.

Thilo I have described the preferred embcdinfients of my invention, cert-ain minor changes or alterations may appear to one skilled in the art to which this invention relates during the extensive manufacture of the saine, and I, therefore, reserve the right to make such changes or alterations as .shall fairly fall within the scope of the appended claim.

What I claim is:

As a new article of manufacture, a safety device :tor door knobs.l comprising a plate provided with a collar extendingthere'from,

a spindle extending through said plate and collar, a knob provided with a shank, .said

shank mounted on said spindle, said shank being externally screw-threaded from the knob to its inner end, said inner threaded end of the shank under said collar, anl internally threaded sleeve on said shank and having one end abutting against the outer end of said collar and its opposite end abutting against a portion of said knob, and

a screw in said shank under said collar and against said spindle, substantially as shown and described.

In testimony whereof I hereunto allix my signature.

WILLIAM JOHNSTON. 

